212 PERCY SLADEN TRUST EXPEDITION 
from it, usually at an obtuse angle to one another ; on the head the punctuation is closer, 
and the striolze almost form a network, but on the thorax and elytra (especially) they are 
much more separated; the striole le in various directions, but usually more or less 
transverse. In D. pygmeum the front margin of the eye is only so shallowly emarginate 
that the emargination is hard to discern, not deeply and sharply emarginate as in 
D. insulare. In D. pygmeum also the club of the antennz is less compact, and joints 
2—6 are proportionately longer, the apex of the scutellum is more bluntly rounded, and 
the first jomt of the hind tarsus is much shorter in proportion to the second ; the series of 
punctures on the elytra are less deeply canaliculate behind, and their arrangement differs 
in various details the 2nd—5th interstices being proportionately rather wide, &c. 
I have also had for comparison a specimen from the Hawaiian Islands of the species 
determined by Dr Sharp as D. subquadratum Fairm.* It closely resembles D. pygmeum, 
having the same short and convex form, and the same kind of punctuation consisting of 
very fine punctures, each with two radiating short striole. It is, however, much larger 
and the punctuation is very much closer; also its elytra do not narrow slightly from the 
shoulder to the point where the margin curves round to the apex, as they do in 
D. pygmeum. It agrees with pygmeum in having the eye not emarginate in front, the 
antenna somewhat less compact than that of D. imsulare, and the apex of the scutellum 
blunt: in the undersides I have been unable to detect any difference; in both the posterior 
femora are very finely and sparsely, the middle femora much more strongly and closely 
punctate. The two forms are at any rate very closely allied. 
Loc. Seychelles. Mahé: near Morne Blanc, XI. 1908, 2 specimens ; Cascade Estate, 
800—1000 feet, 1908—9, 14 specimens. Mauritius T. 
Ca@tostoma, Brullé. 
Cyclonotum, Exichson. 
15. Calostoma rufitarse (Boheman). 
Cyclonotum rufitarse Boheman, Ins. Caffrar., i. 1848, pode 
Celostoma rufitarse Régimbart, Ann. Soc. ent. France, Ixxu. 1903, p. 45. 
Cyclonotum rufitarse Régimbart, op. cit., xxv. 1906, p. 269. 
A series of 31 specimens from Aldabra is referred to this species. For comparison 
I have had a specimen determined as C. rufitarse Boh. from Madagascar (ex coll. 
Régimbart, Paris Museum), and two determined as C. punctulatum Klug, from Mada- 
gascar (ex coll. Sharp, British Museum). The Aldabra specimens agree closely with 
Régimbart’s rufitarse: both they and it are decidedly smaller and considerably less broad 
in proportion than the specimens of punctulatwm, which is in accordance with Régimbart’s 
* Sharp, Fauna Hawaiiensis, vol. iii. part 5, 1908, p. 578, and Trans. R. Dublin Soc., ser. 2, vol. iii. 
1885, p. 218. D. subquadratwm was described by Fairmaire as a Cyclonotwm (Rev. Mag. Zool. (2), i. 1849, 
p- 412) and is included by Zaitzev in the genus Celostoma (= Cyclonotum) (Cat. Hydrophil. 1908, p. 404). It 
was described from Tahiti. 
+ Zaitzev in his Catalogue, 1908, p. 402, gives ‘‘ Madagascar” as the only record of distribution for this 
species. Régimbart after his description gives only “ Tle Maurice: Curepipe (Carié).” I am not aware that it 
has ever been recorded from Madagascar, or anywhere but Mauritius. 
